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Age Calculator

Calculate your exact age in years, months, and days.

Methodology, assumptions, and limitations

Calendar age is calculated by subtracting complete years, then complete months, then remaining days. This calendar method handles varying month lengths rather than treating every month as a fixed number of days.

Assumptions
  • Dates use the Gregorian calendar.
  • The reference date must not precede the birth date.
  • Age changes at the start of the birthday in the selected calendar date.
Limitations
  • Legal age rules can depend on jurisdiction and time of birth.
  • Leap-day birthdays may be treated differently by law or custom.
  • Calendar months cannot be converted exactly into a fixed number of days.

Sources and standards

Related calculators

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Calculator
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Analysis
Interpretation of the current calculator output

Enter values to see detailed analysis and insights.

How to Use

Step-by-step instructions
  1. 1Select your date of birth.
  2. 2Select the target date, which defaults to today.
  3. 3The calculator will display your exact age.
  4. 4Use the analysis and chart tabs to review the same age in different time units.

Date Difference

Calculates the time difference between two dates broken down into years, months, and days.
Age = Target Date - Birth Date

Variables:

YearsFull years elapsed
MonthsRemaining months
DaysRemaining days

Example

Example

Inputs:

Birth:2000-01-01
Target:2023-06-15

Steps:

  1. 1.Years: 2023 - 2000 = 23
  2. 2.Months: 6 - 1 = 5
  3. 3.Days: 15 - 1 = 14
Result:
23 years, 5 months, 14 days

Frequently Asked Questions

Does it account for leap years?

Yes, the calculation correctly handles leap years when determining the elapsed number of days.
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